The two men had posed shirtless lying under a sheet and posted the pic on instagram.

"I went to go say hey to him in his dressing room," Allen told me at the Race to Erase MS benefit for the Nancy Davis Foundation for Multiple Sclerosis. "There were a lot of people there and I asked him, 'What's the way to do the best selfie in bed?' and he showed me. And then he climbed in really quickly and he was like, ‘Let's blow up Twitter for a second.'’

Allen and Franco are co-starring in Palo Alto which is a Gia Coppola-film based on the Oscar nominee's collection of short stories of the same name.

"He is a trip," Allen said. "He's a real trip. He's great work with, an incredible director and a really fun guy to hang out with."

Franco had also shared a shot of himself in solo selfie with a pair of boxers on while he was pulling down to the point of almost exposing himself. He appeared sweaty and gave a happy expression on his face and title the pic, "JUMP ROPE."